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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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1,4-Di-methyl-piperazine-2,3-dione.

Themmila Khamrang1, C Ponraj2, Madhukar Hemamalini3

  • 1Department of Chemistry Dhanamanjuri University, Manipur 795 001 India.

Iucrdata
|December 23, 2024
PubMed
Summary
This summary is machine-generated.

The piperazine-2,3-dione ring in C6H10N2O2 adopts a half-chair conformation. Molecules form sheets in the crystal structure through weak hydrogen bonds.

Keywords:
crystal Structurehalf chairhydrogen bonding

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Structural Chemistry

Background:

  • Piperazine-2,3-dione derivatives are important scaffolds in medicinal chemistry.
  • Understanding the conformational preferences and intermolecular interactions of such compounds is crucial for drug design.

Purpose of the Study:

  • To determine the crystal structure and molecular conformation of the title compound, C6H10N2O2.
  • To investigate the intermolecular interactions present in the solid state.

Main Methods:

  • Single-crystal X-ray diffraction was employed to analyze the crystal structure.
  • Analysis of hydrogen bonding interactions was performed.

Main Results:

  • The piperazine-2,3-dione ring was found to adopt a half-chair conformation.
  • Molecules were observed to form (010) sheets via weak C-H⋯O hydrogen bonds.

Conclusions:

  • The study elucidates the specific conformational behavior of this piperazine-2,3-dione derivative in the solid state.
  • The identified hydrogen bonding network provides insights into crystal packing and potential intermolecular interactions relevant to related compounds.